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Int. J. Mol. Sci. 2017, 18(1), 80; doi:10.3390/ijms18010080

Using Vital Dyes to Trace Uptake of dsRNA by Green Peach Aphid Allows Effective Assessment of Target Gene Knockdown

Plant Biotechnology Research Group, Western Australia State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA 6150, Australia
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Academic Editor: T. G. Emyr Davies
Received: 16 August 2016 / Revised: 21 November 2016 / Accepted: 19 December 2016 / Published: 3 January 2017
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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Abstract

RNA interference (RNAi) is an effective tool to study gene function. For in vitro studies of RNAi in insects, microinjection of double-stranded (ds)RNA may cause stress. Non-persuasive oral delivery of dsRNA to trigger RNAi is a better mode of delivery for delicate insects such as aphids because it mimics natural feeding. However, when insects feed ad libitum, some individuals may not feed. For accurate measurement of gene knockdown, analysis should only include insects that have ingested dsRNA. The suitability of eleven dyes was assessed to trace ingestion of dsRNA in an artificial feeding system for green peach aphids (GPA, Myzus persicae). Non-toxic levels of neutral red and acridine orange were suitable tracers: they were visible in the stylet and gut after feeding for 24 h, and may also attract aphids to feed. Nymphs stained with neutral red (0.02%) were analysed for target gene expression after feeding on sucrose with dsRNA (V-ATPase, vha-8). There was a greater reduction in vha-8 expression and reproduction compared to nymphs fed the diet without dye. The results confirm the importance of identifying aphids that have ingested dsRNA, and also provide evidence that the vha-8 gene is a potential target for control of GPAs. View Full-Text
Keywords: RNA interference (RNAi); double stranded RNA (dsRNA); green peach aphid; Myzus persicae; vacuolar (H+)-ATPase (vha-8); vital dyes; neutral red; acridine orange RNA interference (RNAi); double stranded RNA (dsRNA); green peach aphid; Myzus persicae; vacuolar (H+)-ATPase (vha-8); vital dyes; neutral red; acridine orange
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bilgi, V.; Fosu-Nyarko, J.; Jones, M.G.K. Using Vital Dyes to Trace Uptake of dsRNA by Green Peach Aphid Allows Effective Assessment of Target Gene Knockdown. Int. J. Mol. Sci. 2017, 18, 80.

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